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  1. #21
    Join Date
    Oct 2014
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    DFW, Texas
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    Quote Originally Posted by Mr Nick View Post
    Are those vacuum actuators "tune-able" to open at a different point?
    No sir. Wish there was some adjustment there.
    1972 Plymouth 'Cuda - Not LS-swapped, 5.7L Hemi [MS3 Gold Box], T56 Magnum 6-speed - 'Cuda Build Page
    1976 Dodge D100 - Warlock
    2016 Subaru WRX - E30 Tune

  2. #22
    Join Date
    Aug 2008
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    jacksonville,fl
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    I have zero experience with vacuum actuated exhaust valves, but here's a few thoughts::::
    An example would be on older GM ac/ heat systems you had a large ball which was a vacuum reserve. Maybe some sort of small canister(adjustable size would be nice) that would save just a little vacuum to make them seem less sensitive.
    Probably the only way the valve could be made tunable would be to restrict it , which I think would just make it close slower. Not sure if restriction would make it also open slower??? To have the opposite effect, you'd need to add vacuum.
    I'm pretty sure the average vacuum canister consists of whatever air volume it offers & a check valve to not let vacuum bleed back out to manifold source. Based on that thought, maybe a canister with it's check valve could be installed inline ( Parallel ) with the main feed to offer some effect of momentary continued vacuum as the cannister bleeds down.
    Another much simpler possibility of adjustment would be a tiny pull spring hooked up to the valves to help them in the stay closed direction, thus effectively retarding the vacuum drop effect.
    Just a dumb thought from a high school only educated idiot that thinks more than sleeps.

    Anybody got any better ideas? Bill?

  3. #23
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    Oct 2014
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    So far Iím going to drive it as is and see how the valves hold up before getting too fancy.

    I may install a boost controller valve to help manage the cutout. I can switch it to allow them to always be open, and I think I can get it to run a check valve and keep the valves closed. They donít really bleed off on their own.
    1972 Plymouth 'Cuda - Not LS-swapped, 5.7L Hemi [MS3 Gold Box], T56 Magnum 6-speed - 'Cuda Build Page
    1976 Dodge D100 - Warlock
    2016 Subaru WRX - E30 Tune

  4. #24
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    Aug 2008
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    jacksonville,fl
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    Honestly I think that sort of setup would be more useful, being able to be fully open or fully closed when you want. There are plenty of times when you want to dip into throttle without drawing excessive attention or have that loud idle. I'll probably build me a better cable operated valve on my next exhaust.

  5. #25
    Join Date
    Feb 2007
    Location
    Joliet, IL
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    1,010
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    I was thinking there may be a simple adjustment to have them open at different vacuum signals, similar to a vac advance canister on a distributor. The KISS method may be a spring to delay/slow the opening points, like jlkustomz mentioned.

    With a little tinkering, one could have a Helmholtz chamber and an active exhaust for far less than this kit, albeit with much less adjust-ability as well. https://www.holley.com/products/exha.../71013001-RHKR

    Nick ~
    1969 Cutlass

  6. #26
    Join Date
    Apr 2004
    Location
    Cedar Rapids, IA
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    975

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    I changed mufflers from a straight through design to a the super turbos, this reduced the drone but still there. Then i moved to the VT mufflers. Sad that they are a thing of the past now, because they worked great for me.

    Some times I'm fast sometimes I'm half-fast


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